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Thanks for reaching out. Just a quick note - I can see we're also assisting this via email@example.com; we'll keep an eye out for any replies there so we help you out there.
I'm getting an error DeveloperInactive when I use one of two the API Keys I have registered with MYOB. However when I use another key through POSTMAN that I didn't use to create the Access Token it works correctly. Below are some screen grabs of the POSTMAN requests and responses. I only changed the API Key between running the two request.
Any ideas or fixes for this would be greatly appreciated.